Core for ring-molds.



H. W. ALEXANDER.

CORE FOR RING MOLDS.

APPLICATION FlLED J'UL-Y8, 1915.

1,183,515. Patented May16, 1916.

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H. WALTER ALEKANDER,JOE SAC CITY, IOWA.

cons non RING-HOLDS.

Specification of Letters Patent.

"Patented May 16, 1916.

To all whom it may concern:

Be it known that I, H. WVALTER ALEX- ANDER, citizen of the United States of America, and resident of Sac City, Sac county, Iowa, have invented a new and useful Core for Ring-Molds, of which the following is a specification.

The object of this invention is to provide a permanent expanding and contracting core for ring molds. 1 r

A further object of this invention is to provide an improved permanent core for ring molds adapted for use in molding rings" of various sizes.

My invention consists in the construction, arrangement and combination of elements hereinafter set forth, pointed out in my claims and illustrated by the accompanying drawing, in 'Wl1lCl1 Figure 1 is a vertical section of the com plete device in position for use. Fig. 2 is a sectional elevation ofthe core. Fig. 3 is an elevation of the core at right angles to Fig. 2. Fig. 4 is a plan and Fig. 5 a bottom plan of the core. are on a scale enlarged relative to Fig. 1.

In the construction of the device as shown any suitable mold may be employed such as is formed of mating members 10, 11 removably held together by pins 12, one of which is shown by dotted lines in Fig. 1. The mold members 10, 11 are formed with a central tapering bore adapted to receive the core and around this bore, in the contacting aces of the two members, is formedan annular cavity 13 in which the ring is formed, to which leads a lateral cavity 14 through which the molten material is poured.

In connection with the above described mold I use a permanent core having a frusto-conical body 15, preferably formed of brass or other suitable material. The taper of the core body 15 preferably corresponds to the standard ring taper by which the sizes of rings are commonly established and measured, and by the use of this core with molds of various sizes, having uniformly tapered bores, rings of various sizes, as well as shapes, may be produced. The core body 15 is formed with a longitudinal bore 16 adjacent its rear face, and with a longitudinal slot 17 opening from said slot to the forward face of the said body, whereby an expanding and contracting body is formed, as the body is nearly cut into halves by the Flgs. 2, 3, 4c and 0 said bore and slot. Spaced lugs 18, 19 are formed on and rise from the two halves of the core body 15 and a screw 20 has one end portion seated in the lug 18, and passes loosely through and has its head engaging the outer face of the lug 19, whereby adjustment of the spacing of the said lugs may be obtained by turning said screw. An expansive spring 21 is coiled around the screw 20 between the lugs 18, 19, and holds said lugs, and-the body normally to the limit of expansion as determined by said screw. A

shield 22, formed of a strip of thin metal,

is fixed at one margin to the core body 15 at one side of the face of the slot 17, and overlies and covers said slot, and said shield preferably is inset in the body 15 so as to form a smooth surface.

The advantage of using a permanent core is obvious, both as to convenience of insertion and saving of time. It is also obviously of advantage to employ a core which may be used for a variety of sizes of rings. The expanding and contracting characteristic of the core body is useful in that it permits a contraction of the body incident to the expansion of the molded metal inthe process of cooling; and a further contraction or ap' proximation of the halves of the body, by manually compressing the lugs 18, 19 against the spring 21, so that the core may be withdrawn from the mold.

I claim as my invention- 1. A core for ring molds, comprising a body of frusto-conical form, said body being split longitudinally, and yielding pressure devices acting between the members of said body.

2. A core for ring molds, comprising a body formed with a longitudinal slot opening to one face thereof, spaced lugs on said body on opposite sides of said slot, and means for adjusting the spacing of said lugs.

3. A core for ring molds, comprising a body split longitudinally, yielding pressure devices acting between the parts of said body and normally acting to hold them apart, and means for adjusting the tension of said pressure devices.

4:. A core for ring molds, comprising a body split longitudinally, spaced lugs on said body on opposite sides of the split therein, yielding pressure devices between said lugs, and means limiting the spread of said lugs.

5. A core for ring molds, comprising a body split longitudinally, spaced lugs on the respective members of said body, means limiting the spread of said lugs, and yielding pressure devices between said lugs.

6. A core for ring molds, comprising a body split longitudinally, spaced lugs on the respective members of said body, adjustable means for limiting the spread of said lugs, and yielding pressure devices between said lugs.

7. A core for ring molds, comprising a body formed of a single piece of metal split diametrically almost entirely through so as to be laterally eXpansible and contractible, and a shield fixed at one margin to said body and covering the slot therein.

8. A core for ring molds, comprising a tapered body formed with a slot opening to one face thereof, yielding pressure devices acting expansively between the members of said body, and a shield on said body covering the said slot.

9. A core for ring molds, comprising a body, a slot dividing said body nearly into halves and opening to one face thereof, lugs v of the latter lug, and a spring coiled on said screw between said lugs.

Signed by me at Sac City, Iowa, this 5 day of July, 1915.

H. WALTER ALEXANDER.

. Witnesses:

FRED BUOKNAM, E. E. WILIIELM.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

